Changes in global land surface frozen ground and freeze-thaw processes during 1950-2020 based on ERA5-Land data  

作　　者：Yong YANG Ren-Sheng CHEN Yong-Jian DING Hong-Yuan LI Zhang-Wen LIU 

机构地区：[1]Qilian Alpine Ecology and Hydrology Research Station,Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 73000,China [2]State Key Laboratory of Cryospheric Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 73000,China [3]Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection,College of Resources and Environment,Linyi University,Linyi 276000,China

出　　处：《Advances in Climate Change Research》2024年第2期265-274,共10页气候变化研究进展（英文版）

基　　金：This work was carried out with financial support from the Gansu Provincial Science and Technology Program(22ZD6FA005);the Sciences and Technology Plan Project of Gansu Province(21JR7RA056);the Open Research Fund of the National Cryosphere Desert Data Center(2021kf09);the National Key Research and Development Project(2019YFC1510505);The authors would like to thank the European Centre for Medium-Range Weather Forecasts(ECMWF)for providing the ERA5-Land data and the land cover classification gridded maps.

摘　　要：Frozen ground(FG)plays an important role in global and regional climates and environments through changes in land freeze-thaw processes,which have been conducted mainly in different regions.However,the changes in land surface freeze-thaw processes under climate change on a global scale are still unclear.Based on ERA5-Land hourly land skin temperature data,this study evaluated changes in the global FG area,global land surface first freeze date(FFD),last freeze date(LFD)and frost-free period(FFP)from 1950 to 2020.The results show that the current FG areas(1991-2020 mean)in the Northern Hemisphere(NH),Southern Hemisphere(SH),and globe are 68.50×10^(6),9.03×10^(6),and 77.53×10^(6)km^(2),which account for 72.4%,26.8%,and 60.4%of the exposed land(excluding glaciers,ice sheets,and water bodies)in the NH,SH and the globe,respectively;further,relative to 1951-1980,the FG area decreased by 1.9%,8.8%,and 2.8%,respectively.Seasonally FG at lower latitudes degrades to intermittently FG,and intermittently FG degrades to non-frozen ground,which caused the global FG boundary to retreat to higher latitudes from 1950 to 2020.The annual FG areas in the NH,SH,and globe all show significant decreasing trends(p<0.05)from 1950 to 2020 at-0.32×10^(6),-0.22×10^(6),and-0.54×10^(6)km^(2)per decade,respectively.The FFP prolongation in the NH is mainly influenced by LFD advance,while in the SH it is mainly controlled by FFD delay.The prolongation trend of FFP in the NH(1.34 d per decade)is larger than that in the SH(1.15 d per decade).

关 键 词：Frozen ground Freeze-thaw processes Frost-free period First freeze date Global warming 

分 类 号：P642.14[天文地球—工程地质学]